1/(x+y)-1/(x+y)=3/20 2/(x+y)+3/(x-y)=19/20 这是1/(x+y)-1/(x+y)=3/20 2/(x+y)+3/(x-y)=19/20 这是一个方程组
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y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
y'=(x-y+1)/(x+y-3)通解
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(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
1/(x+y)-1/(x-y)=-3/20,2/(x+y)+3/(y-x)=-(1/5)急啊!
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
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